Final answer:
The term 'pro-ord' is not standard for indicating message precedence, which can usually be immediate, priority, or routine. The given information is more focused on delivery probabilities and times for a furniture company and does not provide an answer for message precedence levels.
Step-by-step explanation:
If a message must be delivered within 1-3 hours, the precedence pro-ord that would be on the message is not identifiable from the provided information. The concept of 'pro-ord' for message precedence is not standard in any known systems, including military, business, or information technology communications. Instead, terms like immediate, priority, or routine might be used to indicate how urgent a message is. Since the information provided seems to relate to the delivery times and probabilities of deliveries for a furniture store, it does not directly answer the initial question about message precedence coding.
Typically, if a message needs to be delivered urgently within a certain timeframe, a precedence level such as priority might be assigned to ensure it is handled swiftly. The information about deliveries from Richard's Furniture Company and customer arrivals is more relevant to calculating expected wait times and the probability of certain delivery events occurring, rather than determining message precedence.